REP14290

• Permit No: C1981041
• IBM Index Class Name: Report
• Doc Name: 1995 Annual Hydrology Report & Mine Inflows Study
• Annual Report Year: 1995
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

• 1995 Annual Hydrologic Report
Page 5
readings were lower than the average for the site. These averages may not be a true
representation of the statistics for the sites due to the sharp change in water level
measurements before and after the end of 1986 when monitoring personnel changed.
Data pages GD-10 contains the result of full suite water analysis done on iJTL-02 and
04 during the Year. Diagrams G95-12 and 13 are trilinear representations of these water
analysis. The circles on the Trilinear diagrams indicate a relative amount of TDS, the
larger the circle the higher the TDS. Both sites showed a higher TDS this Year. The
chemical characteristics at LTTL-02, the upper site, continued to show a wide variation
while the characteristics of the lower site, LJ'TL-04, remained similar to previous sites.
A former mine dewatering hole located at the North Decline area of the mine is now
being used to monitor the water level in the abandoned portions of the Roadside South
Portal. It is monitored primarily to keep it within a 10' zone between the bottom of the
siphon for outfall 002 and the reclaimed Northwest Intake Portal. The results of
monitoring are include in the Mine Water section, Table M95-3.
• Mine Water
The annual mine inflows study for this year was taken the end of September and the
beginning of October 1995. This study is being made a part of the AHR. The results
of the study are given on data pages MA-9 thru 11 and MB-9. A summary of past
conductivity and flows from the monitoring locations are given on Tables M95-I thru
5. Inflow monitoring locations are shown on the 1995 Mine Inflows Map.
As usual there are many differences in the monitoring results at the Roadside South
Portal. These differences are primarily the result of changes in mining locations;
differences in water routing, piping and pumping patterns; and general difficulties
involved with monitoring underground. One difficulty that was more prevalent this
Year, was places where floor heave caused water to flow below the surface of the floor.
Care had to be taken to find measurement locations where a minimum amount of water
was subbing under the floor. Locations 3 and 23 showed more normal flow this Year
indicating little affect from surface irrigation. Locations 24 and 25 continued to be large
contributors this Year. The flow at location 30 showed an increase which may have
corresponded to the lower flow at location 24 and 25. Renewed mining in the vicinity
of location 30 may have caused the change. During the Year a hole was drilled into 11
West from the No. 5 East Mains to allow the flow from location 30 to go to the pump
• in the east end of the No. 5 East Mains. Water from this sump including flows from
locations 24 and 25 was rerouted to the No. 3 South Mains sump. This pumping change